chore: migrate fixture test to createServer

[edmundhung]

Fixes n/a.

Migrate most fixtures to use the new createServer API introduced in #14083.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: covered by existing tests.
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: no new feature

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commit: 719d580